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Goodwill and Intangible Assets, Net of Accumulated Amortization (Components of Intangible Assets, at Cost) (Details) - USD ($) $ in Millions | May 31, 2024 | May 31, 2023
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Intangible Assets [Line Items] |  |
Total intangible assets, gross | $ 698.2 | $ 661.2
Less: Accumulated amortization | 503.7 | 473.8
Intangible assets, net of accumulated amortization | 194.5 | 187.4
Other Intangible Assets [Member] |  |
Intangible Assets [Line Items] |  |
Total intangible assets, gross | 23.1 | 23.0
Client Lists [Member] |  |
Intangible Assets [Line Items] |  |
Total intangible assets, gross | $ 675.1 | $ 638.2

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